CN108369349B

CN108369349B - Lens device, in particular spectacle lens device, and method for producing a lens device

Info

Publication number: CN108369349B
Application number: CN201680064987.0A
Authority: CN
Inventors: J·皮茨; J·普罗赫瑙; R·麦什莫泽
Original assignee: Carl Zeiss Smart Optics GmbH
Current assignee: Carl Zeiss Smart Optics GmbH
Priority date: 2015-09-07
Filing date: 2016-09-07
Publication date: 2020-06-09
Anticipated expiration: 2036-09-07
Also published as: US20180259792A1; WO2017042192A1; EP3347763B1; DE102015114990B4; EP3347763A1; DE102015114990A1; CN108369349A; US10690941B2

Abstract

The invention relates to a lens device (12), in particular an ophthalmic lens device, comprising a base lens element (36) having a first surface (44), said first surface (44) having a first optically effective area (46) and an elongated recess (48) extending adjacent to the first optically effective area (46) and at least partially surrounding the first optically effective area (46). The invention also relates to a method of producing a lens arrangement.

Description

Lens device, in particular spectacle lens device, and method for producing a lens device

Technical Field

The invention relates to a lens device, in particular an eyeglass lens device, having a base lens element, wherein the base lens element has a first surface, and wherein the first surface has a first optically effective area. Furthermore, the invention relates to a method of producing a lens arrangement.

In particular, such a lens arrangement, in particular such an ophthalmic lens arrangement, may be utilized for a display device which may be placed on the head of a user and generate an image. In particular, the invention therefore also relates to a display device having such an ophthalmic lens device.

Background

Such an ophthalmic lens device has been proposed in the prior art. Generally, such ophthalmic lenses have an in-coupling part in the edge area of the ophthalmic lens device. Furthermore, an outcoupling portion is arranged in a central area or a lenticular area of the spectacle lens device. The ophthalmic lens is then adapted to guide a light beam of the generated image coupled into the ophthalmic lens apparatus via the in-coupling part up to the out-coupling part in the ophthalmic lens apparatus and to couple said light beam out of the ophthalmic lens via the out-coupling part. Generally, internal total internal reflection is used for guiding between the input-coupling section and the output-coupling section. For example, a fresnel surface structure may be provided for providing the out-coupling section.

For example, document DE 102013219626 a1 shows an example of such a lens arrangement. This document discloses an ophthalmic lens for a display device which can be placed on the head of a user and generates an image, having an ophthalmic lens body which has a front side and a rear side, wherein the front side and/or the rear side is curved, and the ophthalmic lens body has at least one first and one second partial body whose mutually facing interfaces are in direct contact and, as seen in a plan view of the ophthalmic lens, an input coupling section in an edge region of the ophthalmic lens and an output coupling section in a central region of the ophthalmic lens, wherein the ophthalmic lens is adapted to guide a light beam of pixels of the generated image which is coupled into the ophthalmic lens via the input coupling section of the ophthalmic lens up to the output coupling section in the ophthalmic lens and to couple said light beam out of the ophthalmic lens via the output coupling section, wherein in the ophthalmic lens body a flat first reflective area and a flat second reflective area spaced apart from the first reflective area are arranged, said reflective areas each extending in a direction from the input coupling part to the output coupling part and each being spaced apart from the front side and the rear side of the ophthalmic lens body, wherein the light beam is guided in a direction from the input coupling part to the output coupling part via reflection at both reflective areas, and wherein at least one of the first and second reflective areas is provided in the first or second part body and is offset from the interface of the respective part body in the direction from the first to the second part body.

The optical elements in such ophthalmic lens devices should generally be combined. Here, it may be the case that a plurality of optical elements have to be bonded, for example a plurality of lens elements bonded to each other or to a membrane, a shell or another optical element on the lens elements. When the optical elements are so bonded using an adhesive, the conditions in the edge region are often decisive for the success of the bonding process. If too much adhesive is provided in the adhesive gap between the elements to be joined, the adhesive may be exposed from the side. If too little adhesive is provided, the edge area of the bonded portion may be undesirably filled. This may be accompanied by significant obstacles to subsequent processes if there is no uniform connection and support of the optical elements on the bonding area. During the bonding, no contamination can occur during the bonding process. Furthermore, the presence of cavities or edge regions that are not completely wetted constitutes an obstacle to subsequent wet processing. In some cases, subsequent processing steps may even become impossible. The amount of adhesive to be applied depends on the width of the gap, i.e. the distance between the joining elements, the geometrical tolerances of the joining elements and also the accuracy of the adhesive application. Due to this diversity of parameters, the precise application of the required amount of adhesive is linked to difficulties.

Furthermore, as mentioned above, there is an outcoupling portion within the ophthalmic lens apparatus, which may be embodied as a fresnel surface structure. The free space that is necessarily created when forming the fresnel surface structure, which is referred to below as the cut-out region, should be filled with an optically neutral material in order to avoid, for example, undesirable optical effects, such as image distortions. Such a process may be carried out under reduced pressure or under positive pressure; it may also be carried out, for example, in a different atmosphere, such as in an inert gas, for example nitrogen, or another protective gas. Due to the form, small size and geometry of the fresnel-profile elevations and the cut-out regions located therebetween, air bubbles may form during filling and/or the filling material, which may also be an adhesive, may flow unevenly into the cut-out regions, for example.

Disclosure of Invention

It is therefore an object of the present invention to provide a lens device, in particular an ophthalmic lens device, or a display device having such an ophthalmic lens device, or a method of producing a lens device, in which the above-mentioned disadvantages are avoided.

Thus, according to a first aspect of the present invention, a lens arrangement, in particular an ophthalmic lens arrangement, is provided having a base lens element, wherein the base lens element has a first surface, wherein the first surface has a first optically active area, wherein the first surface has an elongated recess, and wherein the elongated recess at least partially surrounds the first optically active area. In particular, the elongated recess may extend adjacent to the first optically active area, for example.

Here, "optically effective area" is to be understood as meaning the area of the lens device or of the spectacle lens device which provides the desired optical effect. For example, the optically active area may be a central area or a lenticular area. With regard to the term "lenticular area" reference is also made to DIN EN ISO 13666:1998 standard section 13.2. There, the term "lenticular portion" is defined, whereby this refers to that portion of the lenticular lens which has a defined refractive function. The lenticular portion or area is at least partially surrounded by an edge area or carrier edge. Within the scope of the invention, a "lenticular zone" or a "central zone" may also have zero functionality. The lenticular region or central region is that region of the lens arrangement through which viewing is arranged to be performed by a wearer of spectacles having the lens arrangement. It may be, for example, an optically active area or a fresnel surface area. The latter may have a desired optical effect as an outcoupling portion for coupling out radiation that is transported within the ophthalmic lens apparatus via total internal reflection. The optically active area is thus configured such that it provides a predefined optical effect of the base lens element in the lens arrangement.

In particular, the lens means or ophthalmic lens means may be an uncut ophthalmic lens or a rimmed ophthalmic lens, i.e. an ophthalmic lens before or after edging; reference is made, in particular, also to DIN EN ISO 13666:1998 in sections 8.4.7 and 8.4.8.

According to a second aspect, a lens device, in particular an ophthalmic lens device, is provided, having a base lens element, wherein the base lens element has a surface, wherein the surface has a fresnel surface region with a fresnel surface structure, wherein the fresnel surface region has a plurality of fresnel-tooth-shaped elevations, between which cutout regions are located, for providing the fresnel surface structure, characterized in that the surface has an elongated recess, wherein the elongated recess extends adjacent to the fresnel surface structure and interconnects the cutout regions, in particular wherein the depth of the recess into the surface is greater than or equal to the depth of the cutout regions into the surface.

The lens arrangement therefore differs itself by virtue of the optically effective region which is formed in particular by the fresnel surface region with the fresnel surface structure. The elongated recesses then at least partially surround the fresnel surface structure and connect the cut-out regions thereof.

The elongated recess thus makes it possible to apply an excess of adhesive to the base lens element first of all in the case of joining two optical elements of the lens arrangement. For this reason, the elongated recesses can accept an excessive application of adhesive. In this respect, in the case of bonding by means of an adhesive, a slight excess of adhesive can be applied in a targeted manner in order to be "conservative" with regard to the application of the adhesive. In some cases, applying too little adhesive may be significantly more severe because the film or optical element subjected to application may have too little or no stability in the edge region. This can greatly increase the likelihood that a coating applied to the film is susceptible to damage or peeling, for example. The targeted application of a slightly too much adhesive ensures at least the application of the adhesive over the entire area to be joined. Furthermore, the adhesive reservoir in the elongated recess thus formed can prevent air from entering the bonding gap in the event of adhesive withdrawal, for example as a result of shrinkage or thermal expansion. Thus, an over-applied adhesive may form a compensating reservoir. Moreover, with a suitable configuration of the elongated recess, the occurrence of air bubbles or the like in the elongated recess can be avoided by applying the adhesive excessively, as will be explained below. Thus, the adhesive layer may have a neutral effect in terms of its optical properties. In principle, however, the elongated recess should be designed such that it is filled with adhesive as completely as possible. Therefore, no gaps or undercuts should occur.

Even in the case of an optically active region configured as a fresnel surface region, similar advantages can be achieved with an elongated recess. Because it interconnects the cutout regions, separate filling of the cutout regions is avoided or made unnecessary. Again, the occurrence of bubbles in the cut-out region, in particular at the beginning and end of the fresnel structure, can be avoided by completely filling the cut-out region such that the filling material or adhesive enters the elongated recesses from the cut-out region. When filling with adhesive, air is pushed out into the elongated recesses. Furthermore, connecting all cut-out regions by means of the elongated recesses makes adhesive compensation between the cut-out regions possible, so that the exact filling of the individual cut-out regions is no longer decisive. Furthermore, configuring the depth of the elongated recess into the surface of the base lens element to be greater than or equal to the depth of the cutout region into the surface of the base lens element ensures that all bubbles, even at the base of the cutout region, can actually be pressed out into the recess.

The collection area provided by the elongated recess thus allows compensating for variations in the amount of adhesive and the acceleration of the filling process. Thus compensating for variations caused by certain tolerances of the slit thickness, component tolerances or the amount of adhesive applied. Possible adhesives for the lens arrangement may be, for example, acrylates, polyurethanes, epoxy thiols, epoxy amines or silicones.

Thus, when the optically active area is configured as a fresnel surface area, it is ensured that the adhesive or filling material can flow into the base of the cutout area and also the edges of the cutout area are filled sufficiently well. When the filling material or adhesive is applied, the adhesive pushes air along the fresnel surface structure into the elongated recesses. It may be arranged that the region to be wetted by the adhesive or the filler material is activated beforehand, for example by means of a plasma, so that better wetting by means of the filler material or the adhesive is possible. Finally, the wetting and flow properties of the adhesive can be adapted and improved by adapting the speed of the adhesive by adding suitable additives or flow additives, and by adapting the temperature of the adhesive during application or adapting the temperature of the component during application. Furthermore, it may be arranged to continue filling the elongated recesses with the filling material after the fresnel surface region has been filled. In this way, it is also possible, for example, to design the transition of the fresnel surface region to the surrounding region of the lens arrangement in such a way that the transition is no longer recognizable to the user of the lens arrangement and no optical distortion occurs. This may be provided, for example, by using a material for filling purposes having a refractive index substantially corresponding to the refractive index of the material of the lens arrangement. The radius in the elongated recess facilitates clean filling of the complete structure with adhesive and reduces the risk of air bubbles.

Further, according to a third aspect of the present invention, there is provided a method for producing a lens apparatus, the method comprising the steps of: providing a base lens element having a first surface, wherein the first surface has a lenticular region and an elongated recess, and wherein the elongated recess extends adjacent to and at least partially surrounds the lenticular region; applying a liquid adhesive to the lenticular area such that the adhesive completely covers the lenticular area and spreads into the elongated recesses, and/or applying a liquid adhesive to a further optical element, in particular a shell or a membrane, which completely covers the lenticular area; applying a further optical element, in particular a shell or a film, which completely covers the lenticular area, to the base lens element; and curing the adhesive.

According to a fourth aspect of the present invention, there is also provided a method of producing a lens apparatus, comprising the steps of: providing a base lens element having a surface, wherein the surface has a fresnel surface region with a fresnel surface structure, wherein the fresnel surface region has a plurality of fresnel-profile elevations, between which cutout regions are located, for providing the fresnel surface structure, wherein the first surface has an elongated recess, wherein the elongated recess extends adjacent to the fresnel surface structure and interconnects the cutout regions, in particular wherein the depth of the recess into the surface is greater than or equal to the depth of the cutout regions into the surface; filling the cutout area with a liquid filling material such that the filling material completely fills the cutout area and expands into the elongated recess; the filler material is cured.

Finally, according to a fifth aspect, there is provided a display device having at least one lenticular device according to the first aspect or one of its configurations, or at least one lenticular device according to the second aspect or one of its configurations.

The object stated at the outset is therefore fully achieved.

In one configuration of the lens arrangement, the elongate recess may be arranged to extend adjacent the first optically active area.

This can be arranged, for example, if the optically active area is configured as a fresnel surface area. This arrangement is also possible, but not mandatory, if the optically active area is configured as a lenticular area or as a central area. For example, the elongated recesses may also be arranged adjacent to the optically active area only in some parts. Furthermore, there may be a transition region between the elongated recess and the optically active area. The adhesive then passes over the elongate recess as it enters the same from the optically active area.

In a configuration of the lens arrangement, the base lens element may be arranged with a front surface, a rear surface and an edge region, wherein the first surface is the front surface or the rear surface of the base lens element.

In the present lens device or spectacle lens device, the front surface of the base lens element is the side of the lens element facing away from the user. Accordingly, the rear surface is the side of the lens element facing the user. Used according to DIN EN ISO 13666:1998 standard section 5.8, "front surface". Accordingly, the front surface is the area of the lens that faces away from the eye when used as intended. Thus, according to section 5.9, the posterior surface is the side of the lens that faces the eye when used as intended.

Accordingly, the edge face is the face connecting these surfaces to which the frame of the last spectacles is conventionally attached. Thus, the above-mentioned surface is the front or rear surface of the base lens element, which provides the desired optical effect. In particular, this can be a defined function if the optically active area is configured as a lenticular area.

In a further configuration of the lens arrangement, it may be arranged that the base lens element is constructed in one piece.

For example, the base lens element may be formed by casting and suitable post-processing, for example by grinding and/or polishing and/or milling. Injection molding methods and/or molding against a shell mold may be utilized. In principle, however, also multi-component based lens elements are possible.

In a further configuration of the lens arrangement, the elongated recess may be arranged to completely surround the optically active area.

In particular when the optically active area is configured as a lenticular area, the elongated recess can be arranged to completely, i.e. over the entire circumference, surround the lenticular area. However, this is not mandatory. For example, it is also possible to arrange the elongated recess to enclose the lenticular area over an angle of 180 ° or more than 270 °.

In a further configuration of the lens arrangement, the elongated recess may be arranged to have a constant cross-sectional profile transverse to its longitudinal length.

In this way, the elongated recess can be provided particularly easily, for example by means of a milling process. However, manufacture by casting or injection moulding or any other suitable type of production is also possible. The flow properties of the adhesive or filling material in the elongated recess are then also uniform over its longitudinal length.

In a further configuration of the lens arrangement, the elongated recess may be arranged to have a cross-sectional profile transverse to its longitudinal length that varies along its longitudinal length.

In this way, for example, the cross-sectional profile can be matched to the amount of adhesive to be received. Since the optically effective area does not necessarily need to have a circular configuration, the amount of the excessive adhesive may vary in the circumferential direction of the optically effective area. This can be compensated by changing the cross-sectional profile.

In a further configuration of the lens arrangement, it can be arranged that the circumferential contour of the optically active area is circular.

This may be the case in particular when the optically active area is configured as a lenticular area or as a central area. However, the circumferential profile may also be only a part of a circle. This may be the case, for example, when one side of the base lens element is configured to be flattened.

In a further configuration of the lens arrangement, it may be arranged that the circumferential contour of the optically active area is rectangular.

This arrangement is possible, in particular, if the optically active area is configured as a fresnel surface area. Thus, the advantage may thereby arise that the elongated recess can extend exactly along at least one side of the rectangle.

In a further configuration of the lens arrangement, it can be arranged that the first optically effective area is a lenticular area of the base lens element, in particular wherein the first optically effective area is a spherical area, an aspherical area or a cylindrical area.

As already explained above, the lenticular area or central area may achieve a desired prescription for a user of the lens device or ophthalmic lens device. This can be achieved, for example, by spherical, aspherical or cylindrical regions in the case of second-order correction. Furthermore, these can be easily set by machining processing. However, as explained above, casting or injection moulding or any other suitable type of production is also possible.

In a further configuration of the lens arrangement, it can be arranged that the first optically active area is a fresnel surface area with a fresnel surface structure.

As has also been described above, this allows the provision of an outcoupling portion or an incoupling portion in the lens arrangement, for example by means of the base lens element. The fresnel surface region is then configured, in accordance with its tooth shape, such that a desired beam deflection about an angle is made possible, so that the radiation is coupled in or out from total reflection.

In a further configuration of the lens arrangement, it can be provided that the fresnel surface region has a plurality of fresnel-toothed elevations between which the cut-out regions are located, wherein the fresnel-toothed elevations are coated.

For example, the fresnel-toothed lifting portion may be arranged to be coated in order to obtain the desired degree of reflection. Thus, the fresnel tooth-shaped elevations can be provided, for example, with a reflective coating.

In a further configuration of the lens arrangement, it may be arranged that the circumferential contour of the first optically active area is rectangular, wherein the elongated recesses surround the optically active area on only three sides of the rectangular circumferential contour.

In this way, an elongated recess is used particularly advantageously. In particular when the optically active region is configured as a fresnel surface region, the elongated recesses can be arranged such that the cut-out regions between the tooth regions of the fresnel surface region are connected via the elongated recesses at both open ends thereof. By arranging the elongated recesses also at the third side, the parts of the elongated recesses connecting the cutout areas are in turn connected to each other. Thus, the level of filling material or adhesive can be compensated over the entire elongated recess and fresnel surface area, and the air can be completely removed.

In a further configuration of the lens arrangement, the fresnel surface region can be arranged with a plurality of fresnel-profile elevations, with cut-out regions located between the fresnel-profile elevations, wherein the depth of the elongated recesses is greater than or equal to the depth of the cut-out regions.

This ensures that air bubbles at the base of the cutout region can be avoided, since air can be pressed out from there into the elongated recess when the filling material is applied into the cutout region.

In a further configuration, the elongated recess may be arranged to have a cross-sectional profile transverse to its longitudinal length, wherein the smallest radius of the cross-sectional profile is greater than or equal to 0.05 mm. In particular, the minimum radius may be greater than or equal to 0.1mm, 0.15mm, or 0.2 mm.

This ensures that the cross-sectional profile of the elongated recess is completely filled and avoids the occurrence of air bubbles.

In a further configuration of the lens arrangement, it may be arranged that the fresnel surface region is covered by a filler material portion, wherein the filler material portion extends into the elongated recess.

In a lens arrangement thus constructed it is ensured that the fresnel surface region is completely covered by the filling material in part, and that more filling material than is required to fill the fresnel surface region purely is intentionally introduced during the application of the filling material, so that some of the filling material extends into the elongated recesses. Furthermore, this ensures that possible air bubbles in the fresnel surface region are pressed out by the filling material. Thus, the filler material is partially a cured filler material or a cured adhesive.

In a further configuration of the lens arrangement, it may be arranged that the base lens element is formed from a base lens material, wherein the filling material portion is formed from a filling material different from the base lens material, and wherein the refractive index of the base lens material and the refractive index of the filling material are the same at the same reference wavelength. Here, slight deviations within usual tolerances, for example in the refractive index range of 0.001, should still be considered identical.

For example, 546.074nm, i.e., the e-line, may be used as the reference wavelength. For example, a refractive index of n_eThe material Mitsui MR-8 of 1.60 can be used here together with an adhesive or filling material made of epoxy thiol, which likewise has such a refractive index n_e＝1.60。

In a further configuration of the lens arrangement, it may be arranged that the lenticular area is covered by a further optical element, in particular a shell or a film, wherein the further optical element is attached to the lenticular area by an adhesive portion, and wherein the adhesive portion extends out of the lenticular area into the elongated recess.

Such further optical elements, in particular shells or films, may be applied, for example in order to obtain further optical functional components. It may also be used to cover or protect the lens arrangement.

If the adhesive portion extends beyond the lenticular area into the elongated recess, it is ensured that the membrane is supported in its entirety by the adhesive portion. The film does not protrude beyond the adhesive portion so that it cannot be damaged in its edge region and does not have cavities or undercuts.

In a further configuration of the lens arrangement, the adhesive part may be arranged to completely fill the elongated recess.

Thus, it can be arranged that the elongate recesses at least partially surrounding the lenticular region are filled in their entirety in a targeted manner; this may be advantageous, especially in the case of subsequent wet processing, especially since no liquid residues occur in the elongated recesses.

In a further configuration of the lens arrangement, it may be arranged that the elongated recess is a first elongated recess, wherein furthermore the first surface has a second elongated recess, and wherein the second elongated recess extends adjacent to the first optically active area, opposite to the first elongated recess.

This arrangement is possible, in particular, if the optically active area is configured as a fresnel surface region with a rectangular contour. Elongated recesses can then be formed on both sides of the fresnel tooth region and the cut-out region. The elongated recess is then arranged at the open end of the cut-out region.

In a further configuration of the lens arrangement, it can be arranged that the second optically active area is arranged in the first optically active area, wherein the first optically active area is a lenticular area of the base lens element, and wherein the second optically active area is a fresnel surface area with a fresnel surface structure, and wherein the elongated recesses extend adjacent to the second optically active area and at least partially surround the respective optically active area.

Thus, the fresnel surface region may be arranged in a lenticular region.

Thus, it may be arranged cumulatively that the lenticular area is at least partially surrounded by the elongated recesses. Furthermore, the fresnel surface structure arranged in the lenticular area may also be at least partially surrounded by further elongated recesses. The advantages described above then arise for both application scenarios of the optically active area.

In a further configuration, it can be provided that the fresnel surface region is covered by a filler material portion, wherein the surfaces of the filler material portion in the surface of the lenticular region merge into one another in a continuous manner.

In this way, the filler material portion, after curing, may be used to provide the surface of the lenticular area in a continuous manner. For example, the continuous transition may be provided by grinding and/or polishing and/or milling. Casting, injection molding and/or molding against a shell mold are also possible. In particular, this allows providing the optical function of the lenticular region over the entire lenticular region based on an optically "neutral" filling material, i.e. a filling material configured to have the same refractive index. Here, "continuous" is to be understood as meaning a continuously distinguishable surface contour. In other words, there is no bend at the transition.

In a further configuration of the lens arrangement, it may also be arranged that the lenticular area is covered by a further optical element, in particular a shell or a film, wherein the further optical element is attached to the lenticular area by means of an adhesive portion.

Thus, the lenticular area may be provided with elongated recesses, and the fresnel surface area may be provided in the lenticular area, covered by the filling material and surrounded by further elongated recesses. Here, it is also possible to arrange that the lenticular area and thus also the fresnel surface area are covered by a further optical element, in particular a film. More precisely, the portion of the filling material applied to the fresnel surface region then passes through the further optical element, being covered by the further optical element.

In a further configuration of the method for producing a lens arrangement, it may be arranged that after the step of applying a liquid adhesive onto the lenticular areas, there is a further step of filling the elongated recesses with adhesive.

In this way, the method according to the third aspect can be specifically modified such that the elongate recess surrounding the lenticular area is completely covered by adhesive as described above; this is advantageous in particular in the case of subsequent wet processing, because of the completely filled elongate recesses.

In one configuration of the method according to the third aspect, the elongated recess may also be arranged to extend adjacent to the first optically active area.

For example, the elongated recesses may be arranged adjacent to the optically active area only in some portions. Furthermore, there may be a transition region between the elongated recess and the optically active area. The adhesive then passes over the elongate recess as it enters the same from the optically active area.

In the method according to the fourth aspect of the invention, it may also be arranged that the elongated recesses are entirely filled with the filling material after the curing of the filling material. In particular, this may be done so as to provide a continuous surface transition between the fresnel surface region and the likewise adjacent lenticular region. In this way, jumps in optical function can for example be avoided.

In a further configuration of the method according to the fourth aspect, it may be arranged that the step of grinding and/or polishing and/or milling of the filling material is also performed such that the surface of the filling material and the surface of the lenticular area transition each other in a continuous manner.

This also avoids jumps in optical function and simplifies subsequent processing steps on the base lens element.

In a further configuration of the method according to the fourth aspect, it can be arranged that prior to the step of curing there is an application of a further optical element, in particular a shell or a film, which completely covers the fresnel surface region.

It is therefore also possible here to apply a further optical element, in particular a shell or a film, in particular in such a way that it completely covers the fresnel surface region.

In a further configuration of the method according to the fourth aspect, it may be arranged that there is direct molding of the adhesive during the step of filling, in particular against the removable shell mold.

Thus, a casting method or other suitable application method for applying the adhesive may be used. In particular, the adhesive may be applied against a shell mould which then determines the shape of the surface obtained once the shell mould is removed again after curing.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination detailed in each case but also in other combinations or alone without departing from the scope of the invention.

Drawings

Embodiments of the invention are illustrated in the drawings and described in more detail in the following description. In the figure:

figure 1 shows a schematic view of a display device according to the invention having at least one lenticular means,

figure 2 shows a schematic cross-sectional view of an exemplary configuration of a lens arrangement,

figure 3 shows a schematic cross-sectional view of a base lens element of a lens arrangement according to the invention,

figure 4 shows another configuration of the base lens element,

figure 5 shows yet another configuration of the base lens element,

figure 6 shows a magnified schematic view of an elongated recess and a membrane bonded to a base lens element by an adhesive,

figure 7 shows another exemplary configuration of a membrane partially bonded to a base lens element by an adhesive,

figure 8 shows a schematic cross-sectional view of a cross-sectional profile of an elongated recess and a membrane bonded thereto,

figures 9-11 show schematic plan views of fresnel surface regions,

figure 12 shows a schematic cross-sectional view along the line XII-XII in figure 10,

figure 13 shows a schematic cross-sectional view along the line XIII-XIII in figure 10,

FIG. 14 shows a flow chart of a method, an

Fig. 15 shows a flow chart of another method.

Detailed Description

Fig. 1 shows eyewear 10, which may also be a display device for displaying images to a wearer of the eyewear.

The spectacles have lens means 12. This lens arrangement 12 may be a lens arrangement 12 by means of which the image generated via the image-generating device 14 is displayed to the wearer. However, this is not mandatory in all configurations. The lens arrangement 12 may also be a lens arrangement of the glasses 10 without an image being generated by an image generating device 14 coupled thereto. The lens arrangement 12 is held in a frame 16. Furthermore, a second lens device or spectacle lens device 18 is provided. The lens means or ophthalmic lens means 18 may be configured with the same features as the lens means 12. However, they may also have different configurations. Thus, the lens arrangement 12 and the second lens arrangement 18 may be configured to couple the image produced by the image producing apparatus 14 into a user. However, it may also be provided that only one of the

lens arrangements

12, 18, or none of the

lens arrangements

12, 18 as already explained above, is provided for coupling in the image generated by the image generation device 14. In principle, the glasses 10 can also be conventional glasses without an image-generating device.

Fig. 2 shows a schematic cross-sectional view of an example of a lens arrangement 12 arranged for coupling in an image generated by an image generation device 14. The control device 15 controls the image-generating device 14, which delivers an image, schematically represented by an optical path 20, to an observer 22. For this purpose, for example, an in-coupling optical unit 24 can be arranged, which couples the generated image into the lens arrangement 12 via an in-coupling section 26. The light path extends within the lens arrangement 12 through the total internal reflection region 28 and it is output to the wearer and the viewer of the image 22 via the out-coupling section 30. The configuration of the total internal reflection region 28 as a plane-parallel total internal reflection region 28 is merely illustrative of one possible example. For example, the front surface 32 and the back surface 40 of the lens device 12 may also serve as regions of total internal reflection. Thus, both the front surface 32 and the back surface 40 of the lens device 12 may define the total internal reflection region 28. For example, both the in-coupling portion 26 and the out-coupling portion 30 may be provided by fresnel surface structures. In principle, it is not mandatory to provide the in-coupling section 26 and the in-coupling optical unit 24 as shown. In principle, the light path 20 can also be coupled to the total internal reflection region 28 via an edge region 33 of the lens arrangement 12. In this case, the fresnel surface structure may be present only in the outcoupling portion 30.

The lens arrangement 12 has a base lens element 36. The base lens element 36 is only schematically illustrated in fig. 2. The base lens element has a rear surface 32 facing the viewer 22 and a front surface 34 facing away from the viewer. In addition, it has an edge region 33 which has already been described in detail above. The lens arrangement 12 may have further elements 38 in addition to the base lens element. This further element 38 may be a further lens element; however, it may also be just a membrane that should be connected to the base lens element 36, for example. The illustration of this further element 38 is merely schematic and not true to scale. The dimensions of the total internal reflection region 28 are also for illustrative purposes only. The second member may likewise have a front surface 40 facing away from the user 22 and a rear surface 42 facing toward the user. Thus, the back surface 42 of the second element 38 is bonded to the front surface 34 of the base lens element 36. In principle, however, the lens arrangement 12 may also have only a base lens element 36, the front surface 34 of which is provided, for example, with a coating.

Fig. 3 shows a first embodiment of the base lens element 36.

In the illustrated embodiment, base lens element 36 has a first surface 44, which is front surface 34. In principle, however, this could also be the rear surface 32. The first surface 44 has an optically active area 46. In this optically active area, a defined or desired optical function is obtained. In the embodiment illustrated in fig. 3, the optically active area is a so-called lenticular area 50. That is, it is the area at which the user 22 looks at. The lenticular region 50 is surrounded by an edge region 52. The base lens element is attached to the frame 16 by an edge region 52. In principle, the edge region 52 may extend around the entire lenticular region 50. However, due to the cut-out shape of the base lens element illustrated in fig. 3, the lenticular area 50 may also be open towards one edge of the base lens element 36, as in the example of fig. 3. The lenticular region 50 is surrounded by an elongate recess 48. Here, a circular circumferential contour 54 appears in a plan view of the base lens element 36, wherein the circle is open towards the edge in the example illustrated in fig. 3. The representation of the geometric form of the base lens element 36 is to be understood as exemplary only. In principle, the basic element can also have a circular or elliptical circumferential contour, as indicated by the dashed line 53. This applies to the circumferential profile 54 of the lenticular zone 50. As explained below, the elongated recesses in this exemplary embodiment may be particularly useful for simplifying the process of bonding additional optical elements, particularly films or shells, to the surface 44 by adhesive.

Fig. 4 illustrates another embodiment of a base lens element, indicated at 36'. This embodiment may be particularly useful for improving the placement of the fresnel surface region 56. For example, in this exemplary embodiment, the optical path as schematically explained by the optical path 20 may be coupled into the edge region of the base lens element 36 and may be coupled out by the fresnel surface region 56 serving as the out-coupling section 30. The fresnel surface region 56 thus forms an optically active region in this case. In plan view in the example illustrated in fig. 4, it has a rectangular circumferential profile 54. However, this should be understood as exemplary only. Any other circumferential profile 54, such as a circular or elliptical circumferential profile, is also contemplated. In the illustrated exemplary embodiment, the rectangular circumferential profile is entirely surrounded by an elongated recess 48. However, this need not be the case; as will also be described below, the elongated recesses 48 may also be provided on only one, two or three sides of the rectangular circumferential profile 54. As will also be explained below, the elongated recesses can be used here in particular to simplify the application of the filling material to the fresnel surface region.

Fig. 5 shows another possible configuration of base lens element 36. Like elements are denoted by like reference numerals and will not be described again. In this exemplary embodiment, the elongated recesses 48 and the elongated recesses 48 ″ are arranged cumulatively. Thus, in this configuration, base lens element 36 "has two optically

active areas

46 and 46". In addition, a fresnel surface region 56 is provided in the lenticular region 50. The lenticular region 50 is surrounded by an elongated recess 48, as is the fresnel region 56 surrounded by an elongated recess 48 ". In particular in the case of this embodiment, the

elongated recesses

48 and 48 ″ may initially simplify the application of the filler material to the fresnel surface region 56, and may then simplify the subsequent process of bonding the film to the lenticular region 50 and the fresnel surface region 56.

Fig. 6 schematically shows a further optical element 58 which is bonded to the lenticular area 50. For example, the additional optical element 58 may be a membrane or a shell. In the following examples, the further optical element 58 is merely exemplary of a film. Fig. 6 shows a schematic view of the base lens element 36, the lenticular region 50 and the elongated recess 48 introduced into the surface 44, which at least partially surrounds the lenticular region 50. The membrane 58 is bonded to the lenticular region 50 by an adhesive portion 60. The adhesive portion 60 extends in a gap 64 between the lenticular region 50 and the membrane 58. Here, the membrane 58 forms the second element 38 of the lens arrangement 12. In the illustrated view, the adhesive has cured and extends out of the gap 64 into the elongated recess 48. The cross-sectional profile 62 of the elongated recess 48 is indicated at 62. The cross-sectional profile 62 is constant and does not vary over the longitudinal length of the elongated recess 48. As illustrated, the membrane 58 may extend beyond the lenticular region 50 in this case, and it is integrally supported by the adhesive portion 60. As a result of this, it is not critical that an excessively large amount of adhesive be applied so that it emerges from the gap 64. The adhesive can be discharged into the elongated recess 48 and thus support the membrane 58 over its entire area.

Fig. 7 shows an arrangement in which a greater amount of adhesive is introduced into the gap 64 than in fig. 6. Thus, the adhesive portion 60 expands further into the elongated recess 48. However, there is no contamination of the surface 44, since the adhesive can flow into the elongated recesses 48 during application and can also be distributed evenly in the longitudinal direction of the elongated recesses 48. Thus, the uniform application of the adhesive is significantly simplified. Thus, in the final bonded state, this results in the film 58 being uniformly supported by the adhesive portion 60 over its entire area.

Fig. 8 shows another cross-sectional view of the cross-sectional profile 62 of the elongated recess 48. In this configuration, the adhesive portion 60 fills the entire elongated recess 48. In principle, it may be arranged that additional adhesive is applied into the elongated recess 48 after bonding the membrane 58 to the base lens element 36, in order to intentionally completely fill the elongated recess. This may be advantageous for carrying out the process steps after bonding, especially when using additional fluids. They can then no longer collect in the elongated recesses which are only partially filled. Thus, the elongated recesses 48 may be filled with adhesive after bonding the film, so that there is a continuous transition or a transition with a very large radius from the film 58 into the edge area 52, as illustrated in fig. 8. Furthermore, the reservoir of adhesive in the elongated recess thus formed can prevent air from entering the bonding gap in the event of adhesive withdrawal, for example as a result of shrinkage or thermal expansion. Thus, an over-applied adhesive may form a compensating reservoir.

Fig. 9-11 show additional configuration options using elongated recesses 48 in conjunction with the fresnel surface regions in the illustrated exemplary embodiment. Fig. 9-11 schematically illustrate the alignment of the fresnel tooth zone 68. As can be appreciated, the elongated recesses 48 need not completely surround the fresnel surface region. Initially, all that is important is that the fresnel tooth zones 68 or the depressions or cut-out zones arranged between the fresnel tooth zones are connected by the elongated recesses 48. Thus, it may be sufficient for the elongated recesses 48 to extend only on one side of the fresnel surface area 56 substantially perpendicular to the fresnel tooth area 68 and connect the cutout areas. As can be gathered from fig. 11, in addition to the elongated recess 48, a further second elongated recess 70 can be provided, which is not connected to the elongated recess 48. The two

elongated recesses

48 and 70 may then be arranged opposite each other with respect to the fresnel surface area 56. The elongated recesses 48 and/or the elongated recesses 70 may extend beyond the fresnel surface area 56, as indicated by the dashed area 71. This may improve the escape of air.

In particular, however, the elongated recesses 48 may appear adjacent three sides of the fresnel surface region 56. In the plan views illustrated in fig. 9-11, the circumferential profile of the fresnel surface region 56 may be particularly rectangular. The elongated recesses 48 may then be provided along three

sides

72, 73, 74 of the rectangle. The open side 75 can then for example be used to introduce the light path 20 onto the fresnel surface region 56 in order to provide the outcoupling portion 30. Thus, the open ends of the fresnel tooth regions 68 can be connected on both sides by the embodiment illustrated in fig. 10, thus significantly simplifying the filling of the fresnel surface region 56 with filling material.

Fig. 12 shows a schematic cross-sectional view of the fresnel surface region 56 along the line XII-XII. The fresnel toothed region is illustrated in cross-section and is designated by reference numeral 68. If such surface areas are formed of one material, the cutout areas 76 thus appear between the fresnel tooth areas 68. The cutout area 76 should be filled to again provide a smooth surface that, for example, facilitates application of the film 58. Another aspect is that the cutout region 76 cannot be filled with air because it has a different index of refraction than the fresnel tooth region 68. This can create an undesirable media transition in the lens arrangement 12, which can make optical design more difficult. Thus, it may be arranged to fill the cutout regions 76 with a filler material having the same index of refraction as the fresnel profile region 68. Thus, the fresnel toothed region 68 may be coated, for example, to provide desired reflective properties. However, they may also have uncoated embodiments. In principle, it is also possible to provide a filling material with a refractive index that differs from the refractive index of the fresnel tooth region 68 in a targeted manner, in order to produce corresponding reflection properties at the medium transition between the fresnel tooth region 68 and the cut-out region 76 thus obtained.

However, bubbles may form when filling the cutout area 76 with the filler material, particularly at the beginning and end. Moreover, it is relatively cumbersome and difficult to fill each cutout area individually. Thus, connecting the cutout regions by the elongated recesses 48 facilitates avoiding all air bubbles by forcing air laterally out of the cutout regions 76 at either

side

73 or 74. Also, the over-applied filling material may be compensated via the elongated recesses 48 between the individual cutout regions.

Fig. 13 shows one possible cross-sectional profile of an elongated recess between the fresnel surface region 56 and the lenticular region 50. The cutout region 76 has a depth 88. The elongated recess 48 has a depth 90. Strictly speaking, the level on which these

depths

88, 90 are measured is irrelevant. This may be from the level of the first surface 44 or from the top of the fresnel toothed region 68. The elongated recess 48 may extend deeper into the base lens element 36 than the cut-out region 76, or it may extend to the same level. This ensures that no air bubbles can form at the base of the cutout region 76 because the slot base 74 of the elongated recess 48 is located deeper. Furthermore, the elongated recess 48 or its cross-sectional profile 62 preferably exhibits radii 80, 81, 82 in order not to form any sharp corners where possible, since air bubbles may form inwardly at said sharp corners by the flow properties of the filling material or adhesive, preventing wetting over its entire area. For example, it may be arranged that the radii, i.e. radii 80, 81, 82, represent ≧ 0.05 mm. If the elongated recesses 48 are then filled with filler material portions 78, this allows for a substantially continuous transition between the Fresnel surface region 56 and the lenticular region 50. In this way, jumps in optical function for the observer 22 can also be substantially avoided.

Fig. 14 shows a schematic flow diagram of a method 100 for producing a lens arrangement.

According to step 102, a base lens element 36 having a first surface 44 is initially provided, wherein the first surface 44 has a lenticular region 50 and an elongated recess 48, wherein the elongated recess 48 at least partially surrounds the lenticular region 50. The elongated recess 48 may extend adjacent the lenticular region 50. Next, there is the following step 104: applying a liquid adhesive to the lenticular area 50 such that the adhesive completely covers the lenticular area and extends into the elongated recess and/or applying a liquid adhesive to a further optical element 58, in particular a shell or a membrane, which completely covers the lenticular area.

Additional optical elements 58 that completely cover the lenticular area 50 are then applied to the adhesive in step 106. The adhesive is then cured in step 108 so that the bonding process is complete.

Optionally, there may be the following steps in addition: the elongated recesses 48 are filled 110 with adhesive to provide a substantially continuous transition between the lenticular area and the edge area 52.

Fig. 15 shows a schematic flow diagram of a further method for producing a lens arrangement. Initially, there is the step of providing 122 a base lens element 36 having a surface with a fresnel surface region 56 with a fresnel surface structure 77. For the purpose of providing the fresnel surface structure 77, the fresnel surface region 56 has a plurality of fresnel-toothed elevations 68, with the cutout regions 76 located between the fresnel flank elevations. The first surface has elongated recesses 48, wherein the elongated recesses 48 extend adjacent to the fresnel surface structure 77 and connect the cut-out regions 76 to each other. Here, in particular, the depth 90 of the recess 48 into the surface is greater than the depth 88 of the cutout region 76 into the surface.

The cut area is then filled with a liquid filling material. The filler material may also be an adhesive. The latter acts until the filler material completely fills the cut area and extends into the elongated recess. This ensures that all air in the cutout area is pushed out sideways into the elongated recess. The fill material is then cured 126.

Then, there may be a further step of grinding and/or polishing and/or milling 128 the filling material such that the surface of the filling material and the surface of the lenticular area transition into each other in a continuous manner. Molding the adhesive against a removable shell mold is also contemplated. In this way, a flat or continuous surface may again be provided. A film or shell or further optical element 58 may then be applied to the surface, for example.

Claims

1. A lens arrangement (12) having a base lens element (36), wherein the base lens element (36) has a first surface (44), and wherein the first surface (44) has a first optically active area (46), characterized in that the first surface (44) has an elongated recess (48), and wherein the elongated recess (48) at least partially surrounds the first optically active area (46), the elongated recess (48) being adapted to receive adhesive that is over-applied to the first optically active area (46).

2. Lens arrangement according to claim 1, characterized in that the elongated recess (48) extends adjacent to the first optically active area (46).

3. Lens arrangement (12) according to claim 1 or 2, characterized in that the base lens element (36) has a front surface (34), a rear surface (32) and an edge region (33), wherein the first surface (44) is the front surface (34) or the rear surface (32) of the base lens element (36) (36).

4. Lens arrangement (12) according to claim 1, characterized in that the base lens element (36) is constructed in one piece.

5. Lens arrangement (12) according to claim 1, characterized in that the elongated recess (48) completely surrounds the optically active area (46).

6. Lens arrangement (12) according to claim 1, characterized in that the elongated recess (48) has a constant cross-sectional profile (62) transversely to its longitudinal extension.

7. Lens arrangement (12) according to claim 1, characterized in that the elongated recess (48) has a cross-sectional profile (62) which varies along its longitudinal extension transversely to the longitudinal extension.

8. Lens arrangement (12) according to claim 1, characterized in that the circumferential contour (54) of the optically active area (46) is circular.

9. Lens arrangement (12) according to claim 1, characterized in that the circumferential contour (54) of the optically active area (46) is rectangular.

10. Lens arrangement (12) according to claim 1, characterized in that the first optically active area (46) is a lenticular area (50) of the base lens element (36) (36).

11. Lens arrangement (12) according to claim 10, characterized in that the first optically active area (46) is a spherical area, an aspherical area or a cylindrical area.

12. Lens arrangement (12) according to claim 1, characterized in that the first optically active area (46) is a fresnel surface area (56) with a fresnel surface structure (77).

13. Lens arrangement (12) according to claim 12, characterized in that the fresnel surface region (56) has a plurality of fresnel-profile elevations (68), between which the cutout regions (76) are located, wherein the fresnel-profile elevations (68) are coated.

14. Lens arrangement (12) according to claim 12, characterized in that the circumferential contour (54) of the first optically active area (46) is rectangular, wherein the elongated recess (48) surrounds the optically active area (46) on only three sides (71, 72, 73) of the rectangular circumferential contour (54).

15. Lens arrangement (12) according to claim 12, characterized in that the fresnel surface region (56) has a plurality of fresnel-profile elevations (68), between which the cutout regions (76) are located, wherein the depth (90) of the elongated recesses (48) is greater than the depth (88) of the cutout regions (76) or equal to the depth (88) of the cutout regions (76).

16. Lens arrangement (12) according to claim 1, characterized in that the elongated recess (48) has a cross-sectional profile transverse to its longitudinal extension, wherein the smallest radius (80, 81, 82) of the cross-sectional profile is greater than or equal to 0.05 mm.

17. Lens arrangement (12) according to claim 12, characterized in that the fresnel surface region (56) is covered by a filling material portion (78), wherein the filling material portion (78) extends into the elongated recess (48).

18. The lens arrangement (12) of claim 17, characterized in that the base lens element (36) is formed of a base lens material, wherein the filler material is partially formed of a filler material different from the base lens material, and wherein the refractive index of the base lens material and the refractive index of the filler material are the same at the same reference wavelength.

19. Lens arrangement (12) according to claim 10, characterized in that the lenticular region (50) is covered by a further optical element (58), wherein the further optical element (58) is attached to the lenticular region (50) by an adhesive portion (60), and wherein the adhesive portion (60) extends out of the lenticular region (50) into the elongated recess (48).

20. Lens arrangement (12) according to claim 19, characterized in that the further optical element (58) is a shell or a membrane.

21. Lens arrangement (12) according to claim 19, characterized in that the adhesive portion (60) completely fills the elongated recess (48).

22. The lens apparatus (12) of claim 1, wherein the elongated recess (48) is a first elongated recess (48), wherein the first surface (44) further has a second elongated recess (70), and wherein the second elongated recess (70) extends opposite the first elongated recess (48) adjacent the first optically active area (46).

23. Lens arrangement (12) according to claim 1, characterized in that a second optically active area (46) is arranged in the first optically active area (46), wherein the first optically active area (46) is a lenticular area (50) of the base lens element (36), and wherein the second optically active area (46) is a fresnel surface area (56) with fresnel surface structures (77), and wherein the elongated recesses (48) extend adjacent to the second optically active area (46) and at least partially surround the respective optically active area (46).

24. Lens arrangement (12) according to claim 23, characterized in that the fresnel surface region (56) is covered by a filler material portion (78), wherein the surface of the filler material portion (78) and the surface of the lenticular region (50) transition into each other in a continuous manner.

25. Lens arrangement (12) according to claim 24, characterized in that the lenticular region (50) is covered by a further optical element (58), wherein the further optical element (58) is attached to the lenticular region (50) by means of an adhesive portion (60).

26. Lens arrangement (12) according to claim 25, characterized in that the further optical element (58) is a shell or a membrane.

27. An ophthalmic lens apparatus having a base lens element (36), wherein the base lens element (36) has a first surface (44), and wherein the first surface (44) has a first optically active area (46), characterized in that the first surface (44) has an elongated recess (48), and wherein the elongated recess (48) at least partially surrounds the first optically active area (46), the elongated recess (48) being adapted to receive adhesive that is over-applied to the first optically active area (46).

28. A lens arrangement (12) having a base lens element (36), wherein the base lens element (36) has a surface, wherein the surface has a fresnel surface region (56) with a fresnel surface structure (77), wherein the fresnel surface region (56) has a plurality of fresnel tooth-shaped elevations (68), between which cutout regions (76) are located for providing the fresnel surface structure (77), characterized in that the surface has elongated recesses (48), wherein the elongated recesses (48) extend adjacent to the fresnel surface structure (77) and connect the cutout regions (76) to one another, such that a level of filling material or adhesive can be compensated for over the entire elongated recesses and fresnel surface region (56).

29. The lens device (12) of claim 28, wherein a depth (90) of the recess (48) into the surface is greater than a depth (88) of the cutout region (76) into the surface.

30. An ophthalmic lens arrangement having a base lens element (36), wherein the base lens element (36) has a surface, wherein the surface has a fresnel surface region (56) with a fresnel surface structure (77), wherein the fresnel surface region (56) has a plurality of fresnel-profile elevations (68) between which cutout regions (76) are located for providing the fresnel surface structure (77), characterized in that the surface has elongated recesses (48), wherein the elongated recesses (48) extend adjacent to the fresnel surface structure (77) and connect the cutout regions (76) to one another, such that a level of filling material or adhesive can be compensated for over the entire elongated recesses and fresnel surface region (56).

31. A display device (10) having at least one lens arrangement (12) according to any one of claims 1-26 and 28 to 29.

32. A method for producing a lens arrangement (12), the method comprising the steps of:

providing (102) a base lens element (36) having a first surface (44), wherein the first surface (44) has a lenticular region (50) and an elongated recess (48), and wherein the elongated recess (48) at least partially surrounds the lenticular region (50);

-applying (104) a liquid adhesive onto the lenticular area (50) such that the adhesive completely covers the lenticular area (50) and expands into the elongated recess (48), and/or applying (104) the liquid adhesive onto a further optical element (58) completely covering the lenticular area (50);

-applying (106) the further optical element (58) completely covering the lenticular area (50) onto the base lens element (36); and

-curing (108) the adhesive.

33. Method according to claim 32, characterized in that the further optical element (58) is a shell or a membrane.

34. Method according to claim 32, characterized in that there is a further step of filling (110) the elongated recesses (48) with the adhesive after the step of applying the liquid adhesive onto the lenticular areas (50).

35. Method according to any one of claims 32 to 34, characterized in that the elongated recess (48) extends adjacent to the lenticular area (50).

36. A method (120) for producing a lens arrangement (12), comprising the steps of:

providing (122) a base lens element (36) having a surface (44), wherein the surface (44) has a fresnel surface region (56) with fresnel surface structures (77), wherein the fresnel surface region (56) has a plurality of fresnel-profile elevations (68) between which cutout regions (76) are located for providing the fresnel surface structures (77), wherein the surface (44) has elongated recesses (48), wherein the elongated recesses (48) extend adjacent to the fresnel surface structures (77) and connect the cutout regions (76) to one another;

-filling (124) the cut-out region (76) with a liquid filling material, such that the filling material completely fills the cut-out region (76) and expands into the elongated recess (48);

-curing (126) the filling material.

37. Method according to claim 36, characterized in that the depth (90) of the recess (48) into the surface (44) is greater than the depth (88) of the cutout region (76) into the surface (44) or equal to the depth (88) of the cutout region (76) into the surface (44).

38. The method according to claim 36, characterized by the steps of:

-grinding and/or polishing and/or milling (128) the filling material such that a surface of the filling material and a surface of the lenticular region (50) of the lens arrangement (12) transition into each other in a continuous manner.

39. A method according to any one of claims 36 to 38, characterised in that there is an application of a further optical element (58) which completely covers the fresnel surface region (56) before the step of curing (126).

40. The method according to claim 39, characterized in that the further optical element (58) is a shell or a membrane.

41. Method according to any one of claims 36 to 38, characterized in that there is direct moulding of the adhesive during the step of filling (124).

42. A method according to claim 41, wherein said direct moulding is carried out against a removable shell mould.